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Gilbert Miller, Ahmad Khalilian, Jeffrey W. Adelberg, Hamid J. Farahani, Richard L. Hassell, and Christina E. Wells

watermelons ( Citrullus lanatus cv. Wrigley) grown under polyethylene mulch; and (2) to quantify root distribution and root length density of grafted and ungrafted watermelons under adequate and deficient soil moisture treatments. We hypothesized that the

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Maxim J. Schlossberg, Keith J. Karnok, and Gil Landry Jr.

Subjection of intensively managed creeping bentgrass [Agrostis stolonifera L. var. palustris (Huds.). Farw., (syn. Agrostis palustris Huds.)] to supraoptimal soil temperatures is deleterious to root viability and longevity. The ability to estimate viable root length would enable creeping bentgrass managers to more accurately schedule certain management practices. The purpose of this rhizotron study was to develop a model, based on an accumulated degree-day (ADD) method, capable of estimating viable root length density of established `Crenshaw' and `L93' creeping bentgrass maintained under putting green conditions. Viable root length density observations were made biweekly and soil temperature data collected April through September 1997, and January through August 1998 and 1999. Relative viable root length density (RVRLD) is defined as the measured viable root length density divided by the maximum density attained that spring. In both years, maximum annual viable root length density for all plots was reached, on average, by 138 days from the beginning of the year (18 May). Cultivar and year effects were nonsignificant (P = 0.67 and 0.20, respectively). Degree-day heat units were calculated using an array of base temperatures by integral and arithmetical methods. Although the two accumulative methods proved suitable, the model regressing arithmetical degree-day accumulations against the bentgrass RVRLD provided a better fit to the data set. Use of the 10 °C base temperature in the arithmetical ADD calculations provided the following model; RVRLD = 0.98 - [1.30 × 10-4 (ADD)], accounting for 83.8% of the experimental variability (P < 0.0001). As several abiotic/edaphic factors have been shown to significantly influence root growth and viability, development of a widely usable model would include additional factors.

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Li Ma, Chang Wei Hou, Xin Zhong Zhang, Hong Li Li, De Guo Han, Yi Wang, and Zhen Hai Han

( Actinidia Lindl.) vines ( Gandar and Hughes, 1988 ) are bowl-shaped with the roots centered near the stem, whereas older trees have a more layered structure with a higher root length density (RLD) further away from the trunk ( De Silva et al., 1999

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Davie M. Kadyampakeni, Kelly T. Morgan, Arnold W. Schumann, and Peter Nkedi-Kizza

conventional practice irrigated by full circle pattern emitters with a 4.5-m diameter. Table 2. Means and analysis of variance (ANOVA) for citrus root length density distribution as a function of irrigation method (Conventional, Drip, and Restricted

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Shixin Deng, Qun Yin, Shanshan Zhang, Kankan Shi, Zhongkui Jia, and Luyi Ma

, the RLD values were 0.353, 0.390, and 0.280 cm·cm −3 , respectively, which were 3.1, 3.4, and 2.5 times greater than that in T1, respectively. Fig. 3. The effect of root length density, root surface area, root volume, and root mean diameter under

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Desire Djidonou, Xin Zhao, Karen E. Koch, and Lincoln Zotarelli

total root length and more finer roots in tomato plants grafted with ‘Beaufort’ than the self-grafted control. Conversely, Miller et al. (2013) did not find differences in root length density (RLD) between grafted and nongrafted watermelon during a 3

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Lambert B. McCarty, Raymond K. McCauley, Haibo Liu, F. Wesley Totten, and Joe E. Toler

from the growth chamber and placed in a cooler at 5 °C until harvest. Bermudagrass plants were harvested, and seedling number, tiller number, shoot dry weight (SDW), root length density (RLD), root mass density (RMD), specific root length (SRL), and

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Harmandeep Sharma, Manoj K. Shukla, Paul W. Bosland, and Robert L. Steiner

. Fig. 4. Root length density (RLD) among control, partial root-zone drying vertically (PRD v ), and partial root-zone drying compartment (PRD c ) treatments during growing period ( A ) 2013 and ( B ) 2014, respectively. Yield. Number of pods per plant

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Ved Parkash, Sukhbir Singh, Manpreet Singh, Sanjit K. Deb, Glen L. Ritchie, and Russell W. Wallace

years. Table 2. Effect of deficit irrigation levels and cultivars on root length density (RLD), root surface area density (RSAD), and root classification (percent of total root length per diameter class) of cucumber in 60-cm deep soil profile in

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David M. Eissenstat, Denise Neilsen, Gerry H. Neilsen, and Thomas S. Adams

. (Root length was determined by scanning the roots recovered at each depth and sample location.) Root length density (measured in centimeters per cubic centimeter) was estimated at each depth interval, and total root length (measured in centimeters per